Audie Cornish

Every Thursday night you can find Nathan Fields making the rounds of Baltimore's red light district, known to locals as The Block.

An outreach worker with the Baltimore City Health Department, Fields, 55, is a welcome sight outside strip clubs like Circus, Club Harem and Jewel Box.

In the early evening before the clubs get busy, he talks with dancers, bouncers and anyone else passing by about preventing drug overdoses and how to stop the spread of HIV and other sexually transmitted diseases.

A suspected case of measles. A rabid fox on the loose. A recall of a dye used in tattoos. A drug epidemic that's claiming hundreds of lives.

Those are just a few of the problems that Dr. Leana Wen confronts in a typical week as the Baltimore City Health Commissioner. While they all have to be dealt with, it's clear that heroin is among Wen's gravest concerns. Right now, she's focused on stopping overdoses and saving lives.

On a hot, sunny Monday in mid-July, Dr. Leana Wen stood on a sidewalk in West Baltimore flanked by city leaders: Mayor Stephanie Rawlings-Blake, interim police commissioner Kevin Davis, Rep. Elijah Cummings. Under a huge billboard with the web address, she proudly unveiled a 10-point plan for tackling the city's heroin epidemic.

Wen, the city's health commissioner, said she aims to create a 24/7 treatment center, an emergency room of sorts for substance abuse and mental health. She spoke of targeting those most in need, starting with those in jail.

Neighborhoods in Baltimore are still struggling to recover from the riots that broke out following the funeral of Freddie Gray, who suffered a fatal injury to his spine while in police custody. In the aftermath of the unrest, we here at NPR spent many hours trying to understand the raw anger on display. We looked at police brutality, economic disparities and housing segregation in Baltimore.

Our conversations eventually led us to Leana Wen.

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We've learned the names of the Marines killed yesterday in Chattanooga. One was Sergeant Carson Holmquist. He joined the Marines six years ago. From Wisconsin today, his father told NPR, he died doing what he loved - fighting for our country.